They should try just compressing them with mozjpeg anyway, since mozjpeg has deringing https://calendar.perfplanet.com/2014/mozjpeg-3-0/ https://calendar.perfpl

They should try just compressing them with mozjpeg anyway, since mozjpeg has deringing https://calendar.perfplanet.com/2014/mozjpeg-3-0/ https://calendar.perfplanet.com/2014/mozjpeg-3-0/ it's actually not bad for text/cartoons/other things with high-contrast edges